SiUS04-924 Control Specification
30 Function and Control
3.3 Controls at Mode Changing / Start-up
3.3.1 Preheating Operation
Outline Operate the inverter in the open phase operation with conditions including the preheating
command, outdoor air temperature, and discharge pipe temperature from the indoor side.
Detail Outside temperature 50°F(10°C) Control A (preheating for normal state)
Outside temperature < 50°F(10°C) Control B (preheating of increased capacity)
Control A
ON condition
Discharge pipe temperature < 42.8°F(6°C)
Fin temperature < 185°F(85°C)
OFF condition
Discharge pipe temperature > 46.4°F(8°C)
Fin temperature 194°F(90°C)
Control B
ON condition
Discharge pipe temperature < 50.9°F(10.5°C)
Fin temperature < 185°F(85°C)
OFF condition
Discharge pipe temperature > 53.6°F(12°C)
Fin temperature 194°F(90°C)
Note: The power consumption of compressor during preheat operation is 35 W.
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